<div dir="ltr"><div class="gmail_default" style="font-size:small">Dear Artur,<br><br></div><div class="gmail_default" style="font-size:small">I've solved my problem by changing the negative frequency value to a small positive number in the file ..../elph_dir/elph.inp_lambda.<wbr>1 (I got negative frequency at the first q - point).<br><br></div><div class="gmail_default" style="font-size:small">Best regards,<br></div><div class="gmail_extra">Subhodip<br><br>-- <br><div class="m_-1801815506537665027gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><span style="color:rgb(0,0,0)"></span><span style="color:rgb(0,0,0)"><b>Subhodip Chatterjee</b></span><br><span style="color:rgb(0,0,0)"></span></div></div><div><span style="color:rgb(0,0,0)"><b>Senior Research Fellow<br></b></span></div><div><span style="color:rgb(0,0,0)"><b>Department of Chemistry<br></b></span></div><span style="color:rgb(0,0,0)"><b>University of Calcutta</b><br></span></div><div><span style="color:rgb(0,0,0)"><b>Kolkata, India</b></span><br></div></div></div></div></div></div></div></div></div></div>
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